Programmer Lu Chen's bones are inexplicably dissolving, and he has three weeks left to live. An anonymous email led him to the alien material "Origin" deep in the abandoned mine - that was the culprit that eroded him.
The only way to survive is to replace the bones with living metal "Merctis". After the successful operation, Lu Chen became a walking extraordinary weapon and the "key" hunted by all forces.
Until he discovered that his new skeleton could resonate with the skeletal civilization of a distant galaxy. When the call from the stars comes, he is not only the last line of defense for mankind, but also the god of bones who has returned from the alien planet.
